Cities across the world are investing in green roofs to combat urban challenges. Portland is a leader in green roofs, and we’ve learned a great deal about their benefits for managing stormwater and greening our city. But more and more is being learned about the true costs and benefits of green roofs and how they offer a better return on investment. On May 18, 2012, join the City of Portland for a series of presentations and case studies that detail current research examining the green roof bottom line.